1/*
2 * Copyright (c) 2012, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef LayoutPoint_h
32#define LayoutPoint_h
33
34#include "FloatPoint.h"
35#include "LayoutSize.h"
36#include <wtf/MathExtras.h>
37
38#if PLATFORM(QT)
39#include <qglobal.h>
40QT_BEGIN_NAMESPACE
41class QPoint;
42class QPointF;
43QT_END_NAMESPACE
44#endif
45
46namespace WebCore {
47
48class LayoutPoint {
49public:
50    LayoutPoint() : m_x(0), m_y(0) { }
51    LayoutPoint(LayoutUnit x, LayoutUnit y) : m_x(x), m_y(y) { }
52    LayoutPoint(const IntPoint& point) : m_x(point.x()), m_y(point.y()) { }
53    explicit LayoutPoint(const FloatPoint& size) : m_x(size.x()), m_y(size.y()) { }
54    explicit LayoutPoint(const LayoutSize& size) : m_x(size.width()), m_y(size.height()) { }
55
56    static LayoutPoint zero() { return LayoutPoint(); }
57
58    LayoutUnit x() const { return m_x; }
59    LayoutUnit y() const { return m_y; }
60
61    void setX(LayoutUnit x) { m_x = x; }
62    void setY(LayoutUnit y) { m_y = y; }
63
64    void move(const LayoutSize& s) { move(s.width(), s.height()); }
65    void moveBy(const LayoutPoint& offset) { move(offset.x(), offset.y()); }
66    void move(LayoutUnit dx, LayoutUnit dy) { m_x += dx; m_y += dy; }
67    void scale(float sx, float sy)
68    {
69        m_x *= sx;
70        m_y *= sy;
71    }
72
73    LayoutPoint expandedTo(const LayoutPoint& other) const
74    {
75        return LayoutPoint(std::max(m_x, other.m_x), std::max(m_y, other.m_y));
76    }
77
78    LayoutPoint shrunkTo(const LayoutPoint& other) const
79    {
80        return LayoutPoint(std::min(m_x, other.m_x), std::min(m_y, other.m_y));
81    }
82
83    void clampNegativeToZero()
84    {
85        *this = expandedTo(zero());
86    }
87
88    LayoutPoint transposedPoint() const
89    {
90        return LayoutPoint(m_y, m_x);
91    }
92
93#if PLATFORM(QT)
94    explicit LayoutPoint(const QPoint&);
95    explicit LayoutPoint(const QPointF&);
96    operator QPointF() const;
97#endif
98
99private:
100    LayoutUnit m_x, m_y;
101};
102
103inline LayoutPoint& operator+=(LayoutPoint& a, const LayoutSize& b)
104{
105    a.move(b.width(), b.height());
106    return a;
107}
108
109inline LayoutPoint& operator-=(LayoutPoint& a, const LayoutSize& b)
110{
111    a.move(-b.width(), -b.height());
112    return a;
113}
114
115inline LayoutPoint operator+(const LayoutPoint& a, const LayoutSize& b)
116{
117    return LayoutPoint(a.x() + b.width(), a.y() + b.height());
118}
119
120inline LayoutPoint operator+(const LayoutPoint& a, const LayoutPoint& b)
121{
122    return LayoutPoint(a.x() + b.x(), a.y() + b.y());
123}
124
125inline LayoutSize operator-(const LayoutPoint& a, const LayoutPoint& b)
126{
127    return LayoutSize(a.x() - b.x(), a.y() - b.y());
128}
129
130inline LayoutPoint operator-(const LayoutPoint& a, const LayoutSize& b)
131{
132    return LayoutPoint(a.x() - b.width(), a.y() - b.height());
133}
134
135inline LayoutPoint operator-(const LayoutPoint& point)
136{
137    return LayoutPoint(-point.x(), -point.y());
138}
139
140inline bool operator==(const LayoutPoint& a, const LayoutPoint& b)
141{
142    return a.x() == b.x() && a.y() == b.y();
143}
144
145inline bool operator!=(const LayoutPoint& a, const LayoutPoint& b)
146{
147    return a.x() != b.x() || a.y() != b.y();
148}
149
150inline LayoutPoint toPoint(const LayoutSize& size)
151{
152    return LayoutPoint(size.width(), size.height());
153}
154
155inline LayoutPoint toLayoutPoint(const LayoutSize& p)
156{
157    return LayoutPoint(p.width(), p.height());
158}
159
160inline LayoutSize toSize(const LayoutPoint& a)
161{
162    return LayoutSize(a.x(), a.y());
163}
164
165inline IntPoint flooredIntPoint(const LayoutPoint& point)
166{
167    return IntPoint(point.x().floor(), point.y().floor());
168}
169
170inline IntPoint roundedIntPoint(const LayoutPoint& point)
171{
172    return IntPoint(point.x().round(), point.y().round());
173}
174
175inline IntPoint roundedIntPoint(const LayoutSize& size)
176{
177    return IntPoint(size.width().round(), size.height().round());
178}
179
180inline IntPoint ceiledIntPoint(const LayoutPoint& point)
181{
182    return IntPoint(point.x().ceil(), point.y().ceil());
183}
184
185inline LayoutPoint flooredLayoutPoint(const FloatPoint& p)
186{
187    return LayoutPoint(LayoutUnit::fromFloatFloor(p.x()), LayoutUnit::fromFloatFloor(p.y()));
188}
189
190inline LayoutPoint ceiledLayoutPoint(const FloatPoint& p)
191{
192    return LayoutPoint(LayoutUnit::fromFloatCeil(p.x()), LayoutUnit::fromFloatCeil(p.y()));
193}
194
195inline IntSize pixelSnappedIntSize(const LayoutSize& s, const LayoutPoint& p)
196{
197    return IntSize(snapSizeToPixel(s.width(), p.x()), snapSizeToPixel(s.height(), p.y()));
198}
199
200inline LayoutPoint roundedLayoutPoint(const FloatPoint& p)
201{
202#if ENABLE(SUBPIXEL_LAYOUT)
203    return LayoutPoint(p);
204#else
205    return roundedIntPoint(p);
206#endif
207}
208
209inline LayoutSize toLayoutSize(const LayoutPoint& p)
210{
211    return LayoutSize(p.x(), p.y());
212}
213
214inline LayoutPoint flooredLayoutPoint(const FloatSize& s)
215{
216    return flooredLayoutPoint(FloatPoint(s));
217}
218
219
220} // namespace WebCore
221
222#endif // LayoutPoint_h
223